Shimano DEORE XT Rear Derailleur (Di2 spec.) RD-M8250-GS 12 -speed 2nd group

REAR DERAILLEUR, RD-M8250, DEORE XT, GS 12-SPEED, TOP NORMAL, DIRECT ATTACHMENT,2ND GROUP, IND.PACK 

• Robust Design: A wide link structure, skid-plate design, durable aluminum plate and solid pulley add robustness and longevity.
• RD Protection Function: The new Automatic Impact Recovery function instantly returns the derailleur to its original position after impact.
• SHIMANO SHADOW ES: A slimmer, stronger evolution of SHIMANO's pioneering chain-stabilizing SHADOW RD+ Concept.
• Precise & Clean Wireless Shifting: Pinpoint, ultra-fast shifting, and a no-sacrifice 500% gear range.
• Protected Battery: Tucked safely inside an enclosed space, the battery won't budge even in rough terrain, while remaining easily removable for charging. *The battery is sold separately.
• Covered Pulleys/Cage: The solid pulley and shielded pulley teeth prevent trail debris